Looper mechanism for sewing-machines.



L. ONDERDONK.

LOOPER MECHANISM FOR SEWING MACHINES.

. APPLIUATION FILED JULY 9, 1907.

Patented Jan. 5, 1915'.

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LOOPBR MECHANISM FOR SEWING MACHINES.

Patented Jan. 5, 1915.

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APPLICATION FILED JULY 9, 1907.

Patented Jan. 5, 1915.

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To all @071 am it may concern Be it known that l, LANSING ONDERDONK, a citizen of the United States, residing at New York, in the county of New York, State of New York, have invented certain new and useful Improvements in Looper Mechanism for Sewing-'Machines, of which the follow ing is a description, reference being bad to the aceompanyingdrawing and to the let-- ters and figures of reference marked'thereon.

My invention relates to new and useful improvements in looper mechanism for sewing machines, and has for its object to provide a looper-operating mechanism which shall give to the looper a rapid movement at the rear end of its stroke and into the needleloop, with an extended dwell at the forward end of its stroke, whereby the looper thread is held spread for the entrance of the needle.

My invention consists in the parts and imand set forth in the claims.

In the drawings which show byway of illustration one embodiment of my invention, Figure 1 is a front plan-view, partly in section and with the parts broken away,

showing a sewing machine with my looperoperating mechanism applied thereto; Fig.

2 is a bottom plan view of a sewing machine embodying my looper mechanism, with the I feeding mechanism broken away for the sake of clearness; F ig. 3 is-an end view with needle 7.

a portion of the bed plate broken away to show the looper; Fig. 4 is a detail view in plan, showing the looper and its immediate operating mechanism, and also showing in dotted lines the looper in position back of needles; and Fig. 5 is a detail perspective view of my preferred form of looper.

llne bedrplate 1 has rising therefrom an overhanging arm 2, carrying the usual needle mechanism at its forward end, comprising a needle bar 3, which is reciprocated from the main shaft 4, mounted in the overhanging arm. T he looper 5 comprises an outwardly extending shank 6, and a portion which is curved substantially concentric to the axis of the shankof the looper. Said looper as shown in Fig. 4 is mounted so as to oscillate close to, but outside of the As shown in Fig. 4, the looper in its oscillation, moves from a position slightly in Specification of Letters Patent.-

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Application filed July 9, 1907. Serial Ito. aeaeee.

of its stroke, where an extended dwell isv given while the needle rises and descends again into the looper thread loop, which is held spread by the forward position of the looper. After the needle point has entered the looper thread loop, the looper is moved back quickly out of the needle loop, and forward again into the new needle loop, which is thrown out.

In order to give the looper the movements above referred to, I have provided a lever 10 which is pivoted to a stud l1 rigidly.

secured to the under side of the work support. Said lever 10 at its forward end is pivoted at 12 to alink 13, which in turn is pivoted at 14 to an arm 15 extending from the looper support 16, which carries the looper 5. Said looper support 16 is mounted in a bracket 17, which is secured to the under side of the bed plate by suitable screws 18. Said bracket is provided at its forward end with spaced arms 19 and 20.- The looper support is mounted in said arms and secured therein, so as to oscillate, by any suitable means, and the arm 15 is attached to the looper support between the arms of the bracket 19 and 20.

The lever 10 is oscillated by means of the link 21, which link is pivoted at its rear end at 22, to a rock lever 23, which is pivotally mounted at 24 on a swinging arm 25, pivoted to the head of the machine at 26'. Said swinging arm 25 has an upwardly extend- I ing arm 27, carrying a ball stud 28, to which is secured an eccentric strap 29, which cooperates with an eccentric 30, on the main shaft 4. p

The rock lever 23 is provided with a ball stud 31, which is connected to an eccentric strap 32, which in turn coeperates with an eccentric 33 mounted on the main shaft oppositely' disposed relative to the eccentric 30.

.As the main shaft 4 rotates the arm 25 will be raised and lowered and the rock lever 23 will be oscillated; Bv this arrangement lows: Starting with the parts shown in dotted lines in. rig. 4, and with the looper at the rear' end of its stroke, as'the main shaft rotates the looper is moved forward into the needle loop, which is formedby the needle as it starts on its upward movement. Owing to the position of the pivotal points 14, 12

- and 11, between the looper support, the link 13:and the lever 10, as the looper starts to move forward the movement thereof will be very rapid and will gradually decrease in speed until these pivotal connections reach the line ac-w, at'which time the forward movement of the looper'will' cease, and the movement of the pivotal point 12 to the-opposite side of the line H shown in Fig. 4, will practically give little or no movement to said looper; It will be apparent, therefore, that by my arrangement of parts, an extended dwell will be given to the looper at the forward end of its stroke and that when said looper begins its backward movement, said movement will increase in speed until practically the rear end of the stroke of the looper is reached. Furthermore. there will be practically no dwell-at the rear end of the stroke of the looper.

As shown in Fig. 2, I .have slotted the bracket 17 and the screws 18 which hold the bracket to the work support pass through said slotted openings. B loosening the screws 18, the bracket may e adjusted so as to shift the position of the looper relative to the needles. This adjustment is quite important in this type of machine, so that the looper may be ad usted and PTOPePly located for various sizes of needles, Instead of making the bracket adjustable, I may use an eccentric bushing in'the looper support, such as shown for example in the patent to-Hart, 597,610. By turning thisbushing, the adjustment of the looper relative to the needle may be accomplished;

I have also indicated in this figurebv the arrow, the direction of the feed, and what is known as the line of feed which passes through the needle 7', and in the present machine transverse to the length ofthe work support. s

Having thus described my invention, what. I claim as new and desire tosecure by Let- I ters Patent, is

1. The combination with a Work support,-

a needle, meansforreciprocating said needle, a looper located beneath the work support and oscillating about a fixed akis parallel to the path of reciprocation of the needle, said looper being curved about said axis as a center, means for oscillating said looper including an oscillating lever, and a link connecting said oscillating lever to said looper, said link and lever being adapted to move into alinementwhen the looper is at the forward end of its stroke for giving an extended dwell thereto.

2. 'The combination with a work support, a needle, means for reciprocating the needle, of a looper oscillating about a fixcdaxis parallel ,with the path of reciprocation of theneedle, said looper beingcurved about said axis as a center and-being so disposed that the eye thereof at the forward end of its stroke is at one side of the line of feed,

whereby the looper thread running from the I port and oscillatlng about a fixed axis par- 'allel to the path of-reciprocation of the needle, said looper being curved about said axis as a center, means for oscillating said looper including an oscillating lever, a link connecting said oscillating lever to said looper, said link and lever being adapted to move into alinement when the looper is at the forward end of its stroke for giving an extended dwell thereto, a rock lever, a link connecting said rock lever and said oscillating lever, and means for oscillating saidrock lever.

4. The combination with a work support,

a needle, means for reciprocating said ncedle, a looper located beneath the work support and oscillating about a fixed axis parallel to the path of reciprocation of the needle, said looper being curved about said axis as a center, means for oscillating said looper including an oscillating lever, a link connectin said' oscillating lever to said looper, said linkand lever being adapted to move into alinement when the looper-is at the-forward end of its stroke for givingaa extended dwell thereto, a rock lever, a connecting said rock lever and said oscillating lever, an eccentric connection with vthe main shaft for oscillating said rock lever, and means for moving said rock lever bodily. 5. The combination with a needle of a pivoted curved looper oscillating .in a plane substantially at right angles to the, path of the needle, means for operating said looper,

mam ism;

including a lever, a link connecting said In testimony whereof I afiix my signature,

lever to said looper, the pivotal connection in presence 0i two witnesses.

between said link and said lever moving LANSING ONDERDONK.

across a line connecting the axis of said Witnesses" 5 lever and the pivotal connection between R. S. OswALD, said link and said looper. WM. E. HAND. 

